Test failure: System.IO.Tests.BinaryReaderTests.BinaryReader_EofReachedEarlyTests_ThrowsException

[v-haren]

failed in job: https://dev.azure.com/dnceng/public/_build/results?buildId=902316&view=ms.vss-test-web.build-test-results-tab&runId=28813524&resultId=116955&paneView=debug

net6.0-windows-Release-x86-CoreCLR_checked-jitstressregs4-Windows.10.Amd64.Open

Error message

Assert.Throws() Failure
Expected: typeof(System.IO.EndOfStreamException)
Actual:   typeof(System.Text.DecoderFallbackException): Unable to translate bytes [80] at index 2 from specified code page to Unicode.
---- System.Text.DecoderFallbackException : Unable to translate bytes [80] at index 2 from specified code page to Unicode.

Stack trace
   at System.Text.DecoderExceptionFallbackBuffer.Throw(Byte[] bytesUnknown, Int32 index) in /_/src/libraries/System.Private.CoreLib/src/System/Text/DecoderExceptionFallback.cs:line 66
   at System.Text.DecoderExceptionFallbackBuffer.Fallback(Byte[] bytesUnknown, Int32 index) in /_/src/libraries/System.Private.CoreLib/src/System/Text/DecoderExceptionFallback.cs:line 31
   at System.Text.Encoding.GetCharsWithFallback(ReadOnlySpan`1 bytes, Int32 originalBytesLength, Span`1 chars, Int32 originalCharsLength, DecoderNLS decoder) in /_/src/libraries/System.Private.CoreLib/src/System/Text/Encoding.Internal.cs:line 1215
   at System.Text.UTF8Encoding.GetCharsWithFallback(ReadOnlySpan`1 bytes, Int32 originalBytesLength, Span`1 chars, Int32 originalCharsLength, DecoderNLS decoder) in /_/src/libraries/System.Private.CoreLib/src/System/Text/UTF8Encoding.cs:line 648
   at System.Text.Encoding.GetCharsWithFallback(Byte* pOriginalBytes, Int32 originalByteCount, Char* pOriginalChars, Int32 originalCharCount, Int32 bytesConsumedSoFar, Int32 charsWrittenSoFar, DecoderNLS decoder) in /_/src/libraries/System.Private.CoreLib/src/System/Text/Encoding.Internal.cs:line 1164
   at System.Text.Encoding.GetChars(Byte* pBytes, Int32 byteCount, Char* pChars, Int32 charCount, DecoderNLS decoder) in /_/src/libraries/System.Private.CoreLib/src/System/Text/Encoding.Internal.cs:line 1016
   at System.Text.DecoderNLS.GetChars(Byte* bytes, Int32 byteCount, Char* chars, Int32 charCount, Boolean flush) in /_/src/libraries/System.Private.CoreLib/src/System/Text/DecoderNLS.cs:line 143
   at System.Text.DecoderNLS.GetChars(Byte[] bytes, Int32 byteIndex, Int32 byteCount, Char[] chars, Int32 charIndex, Boolean flush) in /_/src/libraries/System.Private.CoreLib/src/System/Text/DecoderNLS.cs:line 121
   at System.Text.DecoderNLS.GetChars(Byte[] bytes, Int32 byteIndex, Int32 byteCount, Char[] chars, Int32 charIndex) in /_/src/libraries/System.Private.CoreLib/src/System/Text/DecoderNLS.cs:line 92
   at System.IO.BinaryReader.ReadString() in /_/src/libraries/System.Private.CoreLib/src/System/IO/BinaryReader.cs:line 302
   at System.IO.Tests.BinaryReaderTests.<>c.<BinaryReader_EofReachedEarlyTests_ThrowsException>b__5_57(BinaryReader reader) in /_/src/libraries/System.IO/tests/BinaryReader/BinaryReaderTests.cs:line 104
   at System.IO.Tests.BinaryReaderTests.<>c__DisplayClass5_0.<BinaryReader_EofReachedEarlyTests_ThrowsException>b__59() in /_/src/libraries/System.IO/tests/BinaryReader/BinaryReaderTests.cs:line 126
----- Inner Stack Trace -----
   at System.Text.DecoderExceptionFallbackBuffer.Throw(Byte[] bytesUnknown, Int32 index) in /_/src/libraries/System.Private.CoreLib/src/System/Text/DecoderExceptionFallback.cs:line 66
   at System.Text.DecoderExceptionFallbackBuffer.Fallback(Byte[] bytesUnknown, Int32 index) in /_/src/libraries/System.Private.CoreLib/src/System/Text/DecoderExceptionFallback.cs:line 31
   at System.Text.Encoding.GetCharsWithFallback(ReadOnlySpan`1 bytes, Int32 originalBytesLength, Span`1 chars, Int32 originalCharsLength, DecoderNLS decoder) in /_/src/libraries/System.Private.CoreLib/src/System/Text/Encoding.Internal.cs:line 1215
   at System.Text.UTF8Encoding.GetCharsWithFallback(ReadOnlySpan`1 bytes, Int32 originalBytesLength, Span`1 chars, Int32 originalCharsLength, DecoderNLS decoder) in /_/src/libraries/System.Private.CoreLib/src/System/Text/UTF8Encoding.cs:line 648
   at System.Text.Encoding.GetCharsWithFallback(Byte* pOriginalBytes, Int32 originalByteCount, Char* pOriginalChars, Int32 originalCharCount, Int32 bytesConsumedSoFar, Int32 charsWrittenSoFar, DecoderNLS decoder) in /_/src/libraries/System.Private.CoreLib/src/System/Text/Encoding.Internal.cs:line 1164
   at System.Text.Encoding.GetChars(Byte* pBytes, Int32 byteCount, Char* pChars, Int32 charCount, DecoderNLS decoder) in /_/src/libraries/System.Private.CoreLib/src/System/Text/Encoding.Internal.cs:line 1016
   at System.Text.DecoderNLS.GetChars(Byte* bytes, Int32 byteCount, Char* chars, Int3

[Dotnet-GitSync-Bot]

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

[GrabYourPitchforks]

Likely dupe of #45317, fixed by #45320